Ryzen 7 1800x nvidia 1080Ti - ubisoft problems

Hello!

I've bought a new PC with Ryzen (you can see all spechs in the atachment) and a GTI 1080Ti, Unfortunatly I can't play my games, Assassin's creed Unity for example (ACU.exe can't run...).

I contacted Ubisoft to solve this problem but they told me that is a processor's problem and they can't do anything.

Here I have read some posts about game problems but all the solutions I've seen are about AMD graphic driver. Unfortunatly I have a Nvidia card (with the last drivers release).

Someone can help me to find a solution?

 

thanks a lot